Hello.
I'm working on an 02 plate 1200 Polo, engine code AWY. About six months ago two DTCs were logged, one for coolant temp sensor and P0420, Catalytic converter system (bank 1) inadequate effect, I know coolant sensors give problems and after replacing the sensor and clearing the code the car has been fine. Now, six months later and several thousand miles, the same code has been logged P0420. It came on after a long drive on the motorway. Before I start looking into possible sensor/cat faults, does anyone know if there is a software update for this issue. Thanks.